Thunderbird is a free, open-source, cross-platform application for managing email and news feeds. It is a local (rather than a web-based) email application that is powerful yet easy-to-use. Thunderbird is developed, tested, translated and supported by the folks at Mozilla Corporation and by a group of dedicated volunteers. Thunderbird gives you control and ownership over your email. There are lots of add-ons available for Thunderbird that enable you to extend and customize your email experience.

Thunderbird gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts.

What's new in Thunderbird 91.0.2:

  • Tags are now colored in mail filter editor
  • Preference for disabling the unread message count badge on Windows taskbar icon added: mail.biff.show_badge


  • Context menu items related to OpenPGP and attachments are now hidden when not applicable


  • Creating a new account with manual setup failed
  • Recipient autocomplete always preferred the primary email address for a contact
  • LDAP performance improvements
  • Extensions listed on the Recommended Addons did not have a clear way to view details in a browser
  • Status checkmark on View > Calendar > Calendar Pane > Show Calendar Pane was reversed
  • mid: URLs in calendar invites did not open the linked mail message
  • Various theme and UX fixes

Download: Thunderbird 91.0.2 for Windows (EN/US) | 64-bit | ~50.0 MB (Open Source)
Download: Thunderbird 91.0.2 for Linux (EN/US) | 65.2 MB
Download: Thunderbird 91.0.2 for Mac OS (EN/US) | 119.0 MB
Download: Thunderbird 91.0.2 in other languages
View: Thunderbird Website | Release Notes | Screenshot